Facile synthesis and characterization of core-shell structured Ag3PO4@ Hal nanocomposites for enhanced photocatalytic properties

摘要

Ag3PO4 is considered to be an ideal candidate for water photo-oxidation and organic contaminant decomposition under visible light due to its appropriate band gap position, nontoxicity, and high quantum yield. However, the prominent low stability and adsorption capacity due to light corrosion hinders the performance improvement. Herein, Ag3PO4 particles coated by halloysite nanotubes (Hal) might display noticeably photocatalytic activities upon light excitation. The Ag3PO4@halloysite nanotubes (Ag3PO4@Hal) nanocomposites could be facile prepared in large quantities through a simple, green, and efficient direct precipitation method. Compared with the individually dispersed Ag3PO4 particles, the as-prepared Ag3PO4@Hal nanocomposites showed the smaller band gap energy. The Ag3PO4@Hal nanocomposites can endow Hal special performance and also improve the catalytic activity of Ag3PO4, which is proposed to have originated from narrow band gap, strong adsorption capacity and low surface recombination rate induced by a negative fixed charge in the Hal shells. The Ag3PD4@Hal nano composites can be used as highly efficient photocatalysts. The current study provides a new paradigm for designing new type nanocomposites with excellent collaborative performance. (C) 2017 Elsevier B.V. All rights reserved.